The common faults of power supply mainly includeNo output voltage、Abnormal output voltage、Switch tube burned out、capacitor failureThe specific manifestations and maintenance methods are as follows:

1、 No output voltage

• Fault manifestation: There is no voltage output after power on, and the output terminal is 0V.

• Common causes: blown fuse, burnt starting resistor, breakdown of switch tube, chip damage.

• Repair method: Check the fuse and starting resistor, replace damaged switch tubes or chips. ‌
  

2、 Abnormal output voltage

• Fault manifestation: Low output voltage, fluctuation, or inability to carry load.

• Common causes: decreased capacity of filtering capacitor, damaged feedback resistor, and voltage regulation circuit malfunction.

• Repair method: Replace the filter capacitor, feedback resistor, and check the voltage regulation circuit. ‌
  

3、 Switch tube burned out

• Fault manifestation: After power on, the fuse melts and the temperature of the switch tube rises abnormally.

• Common reasons: Damage to current detection resistor or feedback resistor leads to overcurrent protection failure, and RCD absorption circuit failure.

• Repair method: Replace the switch tube and associated resistors and capacitors, and check the absorption circuit. ‌
  

4、 Capacitor failure

• Fault manifestations: unstable output voltage, frequent device restarts.

• Common reasons: Aging of electrolytic capacitors leads to a decrease in capacity or leakage.

• Repair method: Replace the faulty capacitor, with a focus on inspecting the filtering capacitor and energy storage capacitor. ‌

5、 Other faults

• Short circuit fault: may be caused byDamaged rectifier bridge orCaused by load short circuit, it needs to be checked after power outage.
  

• Overheating protection: poor heat dissipation orAging of power devices may lead to automatic shutdown.
  

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